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To help make a decision about expansion plans, the director of a music company needs to know how many compact discus teenagers buy annually. Accordingly, she commissions you, a recent employee, to conduct a survey. Suppose that you randomly selected 250 teenagers and asked each to report the number of CDs purchased in the previous 12 months. You found that the sample mean is 4.26 CDs and the sample standard deviation is 3 CDs. Construct a 95% confidence interval around the sample mean. Be sure to show whether you use the t- or z- value, and what value you use. Interpret the confidence interval in a single sentence. In another sentence, state why you used either the "t" or the "z".
Use the trend equation to calculate the points for 2003 and 2005. Plot them on the graph and draw the regression line.
At the .05 significance level, can we conclude that there is a difference in their mean times?
Computation of Expectation, Variance and Covariance.Calculate the variances of Y1 and Y2.
what is the probability of obtaining at least 6 cases in this class if the nationwide rate holds True?
How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?
Does the overall data support the mayor's claim?
Find out the p-value associated with test of hypothesis you conducted?
The field of statistics can be roughly subdivided into two areas: descriptive statistics and probability.
For following two regressions describe and interpret major parts from regression output. write down the difference between two regressions?
A multiple regression equation for list price of homes in certain community in USA is=170,000 -850 X 1 + 28,000 X 2 , where X 1 signifies age in years and X 2 signifies number of rooms.
How much net profit can John expect (on average) to earn from the store in total over the next five years?
A test of hypothesis is conducted at the .05 level of significance to test either or not the population correlation is zero.
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